The translation I used to use is somewhat archaic so I recently asked here for the best translation of it: https://www.reddit.com/r/Stoicism/comments/nexdez/best_trans...
I'd take your pick out of these 4: https://enchiridion.tasuki.org/display:Code:ec,twh,pem,sw/se...
The book also gives a good context on where Stoicism arose, so it might be worthwhile to skim the sections before, though there's no need to get too deep with, say, Aristotle's metaphysics.
It's on archive.org: https://archive.org/details/westernphilosoph035502mbp/page/n...